Altered vascular remodeling in osteopontin-deficient atherosclerotic mice

Journal of Vascular Research
Asa StrömAnna Hultgårdh-Nilsson

Abstract

Osteopontin (OPN) is a cell-binding phosphoprotein with proposed functions in atherosclerosis. The aim of this study was to examine how OPN deficiency affects the atherosclerotic process. ApoE/LDL receptor/OPN triple knockout (ALO) mice were generated by crossing OPN null mice with ApoE/LDL receptor-deficient (AL) mice. Analysis were made on tissue sections from the aortic arch of 8-, 20- and 34-week female AL and ALO mice and included morphometric measurements, collagen staining, TUNEL staining and immunohistochemistry with antibodies to OPN, macrophages and proliferating cellular nuclear antigen (PCNA). Lesion and media areas were significantly smaller and collagen accumulation in lesions was significantly reduced in 34-week-old ALO mice compared with AL mice. The numbers of proliferating and apoptotic cells were increased in lesions of 34 weeks old ALO mice. Furthermore, the plasma levels of SAA and total cholesterol were significantly decreased in 34 weeks old ALO mice. The present study shows that OPN deficiency reduces atherogenesis in atherosclerotic mice. The results corroborate and extend recently published findings and also include novel data on the role of OPN in the process of remodeling, inflammation and lipid meta...Continue Reading

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